Sash-counterbalance.



mw. TREMBATH.

SASH COUNTERBALANCE.

v APPLICATION FILED MAY I5, I9I2. LI Iii Patented Apr.. 13, 1915,

2 SHBETS-SHEBT 1.

3 5 I. l I Y Y HI l D. W. TREIVIBATH.

SASH yC OUNTEIBALNCE. APPLlcmu FILED MAY15,.1912.

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SASH-COUNTERBALANCE.

Application filed May 15, 1912.

To all whom it may concern Be 1t known that I, DIoNYsiUs W. TREM- sA'rn, a citizen of the United States, and av resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Sash-Counterbalances, of which the following is a specification.

This invention relates to windows and particularly to that class used in connection Vwith dwellings and buildings for business purposes.

@ne object is to provide a novel device for Vcounterbalancing sashes, so that they may be readily and easily raised or lowered, the device being so arranged as to present no obstacle to the complete removal of the sash, when desired.

A second object is to provide means, com bined with the counterbalancing device, to eectually lock the sash against movement, as a protection from burglary, and, linally, to provide such means readily applicable to existing structures or to new installations.

'Fliese and other minor objects which will be manifest are attained by the novel construction and arrangement of parts hereinafter described and shown in the accompanying drawings, in which Figure l is a liront elevation of a window, showing the application of my invention at both sides. Fig. 2 is a fragmentary secn tional view, showing the operative mechanism, drawn to an enlarged scale. Fig. 3 is a transverse section, taken on line 3-3 of Fig. 1. Fig. 4 is an enlarged transverse sectional view of the counterbalance, taken on line 4-4 of Fig. 2. Fig. 5 is an enlarged front view of a portion of the window sash, and Fig. 6 is a transverse section of the same, taken on line 7-7 of Fig. 5.

llhe invention comprises sashes 10 and 10, freely slidable, up or down as usual, and having the same general appearance as the usual type. The rear window sash 10', is made narrower than the front sash 10 and runs against a iXed strip 11, at its back, while at its sides are filling strips l2, beyond or outside of which are the vertical members of the window from 13; between the rear and front window sashes are strips 14, having hinges 15, and adapted to swing inwardly, while similar strips 16 are hinged at 17 and are also capable of swinging inwardly thereby allowing the window sashes to be swung inwardly from their normal po- Specication of Letters Patent.

Patented Apr. 13, 1915.

Serial No. 697,484.

sition, as shown in full lines in Fig. 3, or removed bodily; when in the normal position as shown, the window is prevented from swinging as elfectually as if the strip were rigidly secured. From the sides of the sashes a portion of the stile is removed, and in the spaces thus formed are rigidly secured sheet metal plates 18, bent at an angle, like the character Z, so that their outer sides register with the sash edges and extend along their entire length; in the plates are formed a plurality of regularly spaced slots or perforations 19, having a rounded bottoni and angular walls. The inner face 18, also serves as a track or runway against which a revolving part of mechanism further on described contacts. At one side of the window sill is inserted a metal plate 20, set flush with the surface of the sill upon which the window rests. This plate is provided with an opening in which is a pintle 21, the same being a part of the bracket 22, secured to the lower left hand corner of the window sash; similarly near the top of the sash is a duplicate bracket 23 secured on the side of the window frame in register with the lower bracket and formed with it is another pintle engageable with an opening in the projection extending from the bracket 24 set in the side of the window frame. These pintles act in the manner of hinges in perinitting the window to be swung inwardly when desired. It is evident also that by raising the pintles and window sashes that they will be free from their bearings, and the sashes as a whole, can be bodily removed.

The counterbalancing device consists of a metal face plate 25, having side plates 26 and 27 adapted to extend into a mortise formed in the side walls of the window frame and held securely in position by means of screws passing through the holes in the face plate 25. Between the side members 26 and 27 is secured a tube 28, through which passes the bolt 29, having a head 30 and a screw threaded nut 31 on its oppo-site end, the bolt being adapted to draw the sides together, holding the tube 28 rigidly between. Surrounding the tube is a spirally coiled fiat spring 32, one end of which is engaged with a slot in the tube 28 and the other end rigidly secured to an annular casing 33, which revolves on the tube, and has integrally formed therewith a cap or cover 34 opposite to which is a the said pins being in engagement with lsome one lof the'perforations at all times when the window `is inoperative position. Y'

From the foregoing, it is evident that the force of the spring 32 may be transmitted to the disk 36 and in such manneras to cause the pins 37 to press against the lower surface of the indentations 19, thereby exerting a tendency to raise the plate and sash, balancing the same, provided the spring has been properlyfadjusted with respect to the weight of the sash.

Inorder to hold the window sash at any point where it may be desired, there is provided a lever 38 having a suitably formed button or head 39, at vthe end, extending alongside the window sash, where it may be readily accessible, while at the other end it is connected by a pivot 40, to the side plate 26 of the counterbalance frame. At about the vertical center line of the mechanism, pivotally connected to the lever 38 by the pin 41, is a latch-link 42, having an opening 43, passing over the head 30 of the bolt 29, the said link extending downwardly to a point below the periphery of the disk 36, where it is bent at a right angle 44, its extreme end'45 being turned rentrantly upward, so as to enable it to extend in between any two adjacent pins 37, locking them vagainst movement. Y From the foregoing it will be evident that when the latch-link 42 is depressed by the lever 38, the rentrantly turned latch end 45 clears the pins 37 allowing the disk to revolve, which it does when the window is raised or lowered; also that the periphery Vof thedisk 36 is permitted to contact with thev surface of thek plate 18, which affords a vsmooth and regular surface in operating ythe window,v the disk acting as a guide roller to the window sash.

When it is desired to hold the window closed or in any position, the lever 38 is `moved upward, whereupon vthe latch end 45 is brought inbetween the pins effectually locking the disk 38 against rotation in either direction, thereby securely holding the window sash wherever it may be placed.

Copies ofV this patent may be obtained for In ordinary light windows a single counterbalance on one side of the window sash will be suiicient, but on heavier windows a counterbalance may be used on each side, the window sash thus being provided upon n both its edges with Z-shaped metal plates as shown.

I am aware that spring balances in themselves are not new; also that rack and pinion arrangements have been devised with a similar purpose in view, therefore I do not claim these features broadly as my inven tion, but

That I do claim and desire to secure by Letters Patent is 1. In combination with awindow sash and frame, a metal plate secured to the side of said window sash, said plate being formed at an angle so as to present two surfaces facing outwardly, one in advance of the other and toward the front of said sash, said plate being provided with a series of uniformly spaced openings, the openings being in the outer corner portion of the plate, a spring drum mounted at the side of said sash, in the frame thereof, a housing therefor, a disk secured to said Avdrum and so disposed that its periphery contacts with the inner face of said plate, and a plurality of pins set in the side of said disk adapted to engage' with the openings in said plate.

2. In combination with a window sash and frame, a metal plate secured to the side of said window sash, said plate being formed at an angle so as to present two surfaces facing outwardly, one in advance of the other and toward the front of said sash, said plates being provided with a series of uniformly spaced openings, the openings being in the outer corner portion of the plate, a spring drum mounted at the side of said sash, in the frame thereof, a housing therefor, a disk secured to said drum and so disposed that its periphery contacts with the ve cents each, by addressing the Commissioner of Patents,

Washington, D. (1. 

